# print("Hello python!")

# x = 1
# y = 2
# print(x + y)


def main():
    # print("main")
    # print(add(1, 3))
    score = int(input("Please input your score : "))
    if 90 <= score <= 100:
        print('A')
    elif score >= 80:
        print('B')
    elif score >= 70:
        print('C')
    elif score >= 60:
        print('D')
    else:
        print('Your score is too low')


def add(x, y):
    """
    coment
    coment
    """
    hello = "Hello Hello Hello Hello Hello\
     Hello Hello Hello Hello Hello Hello Hello\
      Hello Hello Hello Hello Hello"
    x = x * 2  # x =2
    if y < 0:
        y = y * -1
        x = x + 1
    return x + y


def add2(x, y):
    return x * 2 + y * 2


if __name__ == "__main__":
    main()
